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Journal of Zhejiang University SCIENCE A

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Thermal strain response of saturated clays in 1D condition

Author(s): Qi-yin Zhu, Tian-yu Zhao, Pei-zhi Zhuang
Affiliation(s): State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China; more
Corresponding email(s): qiyin.zhu@cumt.edu.cn
Key Words: Thermal strain response; Saturated clay; Thermoplasticity

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Abstract: The main purpose of this study is to interpret the thermoplastic volumetric response of saturated clay during heating and cooling based on thermoplasticity. A two-yield-surface model for describing the thermo-mechanical behavior of both normally consolidated and overconsolidated saturated clay is proposed. Compared with similar existing models, the novelty of the proposed model lies mainly in two aspects: (a) a new equation directly expressing the thermoplastic strain with one additional parameter is proposed which is related to the stress condition and temperature increment; (b) a newly defined coupling mechanism of thermal and mechanical surfaces is used which is more concise. The capabilities of the proposed models to describe the observed experimental behavior were analyzed by predicting the thermal deformation of illite clay and loess suffering thermomechanical loading. Specifically, the accumulated volumetric strains in 1D conditions after multiple heating and cooling cycles were simulated and discussed.

一维应力状态下饱和黏土热应变响应本构研究

目的:基于热力耦合试验,揭示饱和黏土热塑性应变机理,提出一个更合理的热塑性方程,并用于描述复杂热力耦合条件下饱和黏土应变响应.
方法:1. 通过试验结果分析、理论推导提出本构关系;2. 通过参数分析和试验模拟,验证本构关系的有效性及合理性.
结论:通过对饱和黏土在不同热力耦合条件下的试验结果验证,本文提出的双屈服面热力耦合本构关系可以很好地模拟热循环下饱和黏土应变响应.
关键词组：饱和黏土;热力耦合;非等温;热循环;双屈服面模型

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一维应力状态下饱和黏土热应变响应本构研究

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